GeForce GT 640 DDR3 vs Radeon HD 6970

Intro

Compare those specifications to the Radeon HD 6970, which comes with core clock speeds of 880 MHz on the GPU, and 1375 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs along with 96 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 6970		3470 points
GeForce GT 640 DDR3		1560 points
	Difference: 1910 (122%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon HD 6970		250 Watts
	Difference: 185 Watts (285%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6970 is 209% faster than the GeForce GT 640 DDR3 overall, because of its higher data rate. (explain)

Radeon HD 6970		176000 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 118976 (209%)

Texel Rate

The Radeon HD 6970 should be quite a bit (approximately 193%) faster with regards to anisotropic filtering than the GeForce GT 640 DDR3. (explain)

Radeon HD 6970		84480 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 55680 (193%)

Pixel Rate

The Radeon HD 6970 will be much (approximately 96%) faster with regards to AA than the GeForce GT 640 DDR3, and will be capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 6970		28160 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 13760 (96%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the bus width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.